Language:
كتاب الحج
25  
Hajj (Pilgrimage)
(98)
Chapter: Whosoever sent the weak amongst his family (women and children) early (from Al-Muzdalifa to Mina) at night after the moon had set. They stayed at Al Muzdalifa and invoked Allah there and proceeded from there when the moon had set
(98)
باب مَنْ قَدَّمَ ضَعَفَةَ أَهْلِهِ بِلَيْلٍ، فَيَقِفُونَ بِالْمُزْدَلِفَةِ وَيَدْعُونَ وَيُقَدِّمُ إِذَا غَابَ الْقَمَرُ
Sahih al-Bukhari 1678

Narrated Ibn `Abbas:

I as among those whom the Prophet (ﷺ) sent on the night of Al-Muzdalifa early being among the weak members of his family.

حَدَّثَنَا عَلِيٌّ، حَدَّثَنَا سُفْيَانُ، قَالَ أَخْبَرَنِي عُبَيْدُ اللَّهِ بْنُ أَبِي يَزِيدَ، سَمِعَ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ يَقُولُ أَنَا مِمَّنْ، قَدَّمَ النَّبِيُّ صلى الله عليه وسلم لَيْلَةَ الْمُزْدَلِفَةِ فِي ضَعَفَةِ أَهْلِهِ‏.‏
Reference : Sahih al-Bukhari 1678
In-book reference : Book 25, Hadith 158
USC-MSA web (English) reference : Vol. 2, Book 26, Hadith 738
  (deprecated numbering scheme)